// 聊天室好友与通用大卡片广播通知监听，集中管理 Echo 订阅和弹窗渲染。

import { escapeHtml } from "./html.js";

/**
 * 读取页面 CSRF Token。
 *
 * @returns {string}
 */
function getCsrfToken() {
    return document.querySelector('meta[name="csrf-token"]')?.content ?? "";
}

/**
 * 等待 Echo 与聊天上下文就绪后再订阅频道。
 *
 * @param {Function} callback
 * @returns {void}
 */
function whenEchoReady(callback) {
    if (!window.Echo || !window.chatContext) {
        window.setTimeout(() => whenEchoReady(callback), 500);
        return;
    }

    callback();
}

/**
 * 同步移除对方好友关系。
 *
 * @param {string} username
 * @returns {Promise<void>}
 */
async function removeFriendBack(username) {
    await fetch(`/friend/${encodeURIComponent(username)}/remove`, {
        method: "DELETE",
        headers: {
            "Content-Type": "application/json",
            "X-CSRF-TOKEN": getCsrfToken(),
            "Accept": "application/json",
        },
        body: JSON.stringify({
            room_id: window.chatContext?.roomId,
        }),
    });
}

/**
 * 显示好友添加居中大卡弹窗。
 *
 * @param {string} fromUsername
 * @param {boolean} hasAddedBack
 * @returns {void}
 */
export function showFriendBanner(fromUsername, hasAddedBack) {
    if (!window.chatBanner) {
        return;
    }

    if (hasAddedBack) {
        window.chatBanner.show({
            id: "friend-banner",
            icon: "🎉💚🎉",
            title: "好友通知",
            name: fromUsername,
            body: "将你加为好友了！",
            sub: "你们现在互为好友 🎊",
            gradient: ["#065f46", "#059669", "#10b981"],
            titleColor: "#a7f3d0",
            autoClose: 5000,
        });
        return;
    }

    window.chatBanner.show({
        id: "friend-banner",
        icon: "💚📩",
        title: "好友申请",
        name: fromUsername,
        body: "将你加为好友了！",
        sub: "但你还没有回加对方为好友",
        gradient: ["#1e3a5f", "#1d4ed8", "#0891b2"],
        titleColor: "#bae6fd",
        autoClose: 0,
        buttons: [
            {
                label: "➕ 回加好友",
                color: "#10b981",
                onClick: async (button, close) => {
                    await window.quickFriendAction?.("add", fromUsername, button);
                    if (button.textContent.startsWith("✅")) {
                        window.setTimeout(close, 1500);
                    }
                },
            },
            {
                label: "稍后再说",
                color: "rgba(255,255,255,0.15)",
                onClick: (button, close) => close(),
            },
        ],
    });
}

/**
 * 订阅好友私有频道通知。
 *
 * @returns {void}
 */
export function setupFriendNotification() {
    whenEchoReady(() => {
        const myId = window.chatContext.userId;

        window.Echo.private(`user.${myId}`)
            .listen(".FriendAdded", (event) => {
                showFriendBanner(event.from_username, event.has_added_back);
            })
            .listen(".FriendRemoved", (event) => {
                const fromUsername = String(event.from_username ?? "");
                const safeUsername = escapeHtml(fromUsername);

                if (event.had_added_back) {
                    window.chatToast?.show?.({
                        title: "好友通知",
                        message: `<b>${safeUsername}</b> 已将你从好友列表移除。<br><span style="color:#6b7280; font-size:12px;">你的好友列表中仍保留对方，可点击同步移除。</span>`,
                        icon: "👥",
                        color: "#6b7280",
                        duration: 10000,
                        action: {
                            label: `🗑️ 同步移除 ${fromUsername}`,
                            onClick: async () => removeFriendBack(fromUsername),
                        },
                    });
                    return;
                }

                window.chatToast?.show?.({
                    title: "好友通知",
                    message: `<b>${safeUsername}</b> 已将你从他的好友列表移除。`,
                    icon: "👥",
                    color: "#9ca3af",
                });
            });
    });
}

/**
 * 订阅通用大卡片通知广播。
 *
 * @returns {void}
 */
export function setupBannerNotification() {
    whenEchoReady(() => {
        const myId = window.chatContext.userId;
        const roomId = window.chatContext.roomId;
        const showBanner = (event) => {
            if (event.options && typeof event.options === "object") {
                window.chatBanner?.show?.(event.options);
            }
        };

        // 私有频道只推送给指定用户，房间频道推送给当前房间在线用户。
        window.Echo.private(`user.${myId}`).listen(".BannerNotification", showBanner);

        if (roomId) {
            window.Echo.join(`room.${roomId}`).listen(".BannerNotification", showBanner);
        }
    });
}

/**
 * 绑定好友与大卡片通知监听，并暴露旧全局函数。
 *
 * @returns {void}
 */
export function bindFriendNotificationControls() {
    if (typeof window === "undefined") {
        return;
    }

    window.showFriendBanner = showFriendBanner;
    window.setupFriendNotification = setupFriendNotification;
    window.setupBannerNotification = setupBannerNotification;

    setupFriendNotification();
    setupBannerNotification();
}